fix Instagram SSR hydration embeds

[rosethornbush]

Summary

• preserve the old Instagram GraphQL parser in instagram_old.ts
• replace active Instagram fetching with logged-out SSR hydration parsing
• map image posts, carousels, and reels into the existing normalized post shape

Why

Instagram's GraphQL route no longer returns the needed public media structure reliably. Logged-out pages include the media payload in ScheduledServerJS / RelayPrefetchedStreamCache hydration data when fetched with browser-style headers.

Validation

• pnpm exec tsc -p packages/platforms/tsconfig.json --noEmit --pretty false
• platforms:lint
• platforms:fmt/check
• live smoke against one image post, one carousel post, and one reel with the provided EMBED_USER_AGENT

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Latest commit: 26eddfc

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	embedly-docs	26eddfc	Commit Preview URL Branch Preview URL	Jun 29 2026, 02:28 AM